#box {
    width: 100px;
    height: 100px;
    color: red;
    background-color: blue;
    display: flex;
    backface-visibility: hidden;
}

#img1 {
    width: 100px;
    height: 100px;
    background-image: url("./1.png");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

#img2 {
    width: 100px;
    height: 100px;
    background-image: url("./2.jpg");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

#img3 {
    width: 100px;
    height: 100px;
    background-image: url("./3.gif");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
